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diff --git a/tests/unistr/test-u16-check.c b/tests/unistr/test-u16-check.c
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+/* Test of u16_check() function.
+ Copyright (C) 2010 Free Software Foundation, Inc.
+
+ This program is free software: you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 3 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
+
+/* Written by Bruno Haible <bruno@clisp.org>, 2010. */
+
+#include <config.h>
+
+#include "unistr.h"
+
+#include "macros.h"
+
+int
+main ()
+{
+ /* Test empty string. */
+ {
+ static const uint16_t input[] = { 0 };
+ ASSERT (u16_check (input, 0) == NULL);
+ }
+
+ /* Test valid non-empty string. */
+ {
+ static const uint16_t input[] = /* "Данило Шеган" */
+ { 0x0414, 0x0430, 0x043D, 0x0438, 0x043B, 0x043E, 0x0020, 0x0428, 0x0435, 0x0433, 0x0430, 0x043D };
+ ASSERT (u16_check (input, SIZEOF (input)) == NULL);
+ }
+
+ /* Test out-of-range character with 2 units: U+110000. */
+ {
+ static const uint16_t input[] = { 0x0414, 0x0430, 0xDBFF, 0xE000 };
+ ASSERT (u16_check (input, SIZEOF (input)) == input + 2);
+ }
+
+ /* Test surrogate codepoints. */
+ {
+ static const uint16_t input[] = { 0x0414, 0x0430, 0xDBFF, 0xDFFF };
+ ASSERT (u16_check (input, SIZEOF (input)) == NULL);
+ }
+ {
+ static const uint16_t input[] = { 0x0414, 0x0430, 0xDBFF };
+ ASSERT (u16_check (input, SIZEOF (input)) == input + 2);
+ }
+ {
+ static const uint16_t input[] = { 0x0414, 0x0430, 0xDFFF };
+ ASSERT (u16_check (input, SIZEOF (input)) == input + 2);
+ }
+ {
+ static const uint16_t input[] = { 0x0414, 0x0430, 0xDFFF, 0xDBFF };
+ ASSERT (u16_check (input, SIZEOF (input)) == input + 2);
+ }
+
+ return 0;
+}